SEAT BELT WARNING SYSTEM Rear Seat Belt Warning Light Malfunction

DESCRIPTION

When the rear seat belt is not fastened after the rear door is opened and closed with the power switch on (IG), the rear seat belt warning is shown on the multi-information display in the combination meter assembly. The main body ECU (multiplex network body ECU) detects whether any of the rear doors are open or closed based on the courtesy light switch condition and then sends the rear door status signal to the combination meter assembly. The rear seat inner belt assembly detects whether the seat belt is fastened or unfastened based on each buckle switch condition and then sends the seat belt status signal to the combination meter assembly. When the combination meter assembly detects that any courtesy light switch is turned off while the power switch is on (IG), or that any courtesy light switch is turned off and then the power switch is turned on (IG), the combination meter assembly shows the rear seat belt warning on the multi-information display. Then the combination meter assembly shows the current status of the rear seat belts according to each buckle switch condition.

WIRING DIAGRAM

A003ZFFE01

INSPECTION PROCEDURE

Note

The seat belt warning system uses the CAN communication system. First, confirm that there is no malfunction in the CAN communication system. Refer to the How to Proceed with Troubleshooting procedure Click here.

PROCEDURE


  1. CHECK REAR SEAT BELT WARNING


    1. Turn the power switch off and lock all doors.

    2. Unlock all doors and turn the power switch on (IG).

    3. Open and close the rear RH door. Then, check that the multi-information display on the combination meter assembly displays the rear seat belt warning.

      OK
      The rear seat belt warning is displayed.

    4. Turn the power switch off and lock all doors.

    5. Unlock all doors and turn the power switch on (IG).

    6. Open and close the rear LH door. Then, check that the multi-information display on the combination meter assembly displays the rear seat belt warning.

      OK
      The rear seat belt warning is displayed.

    7. Turn the power switch off and lock all doors.

    8. Unlock all doors and turn the power switch on (IG). Then, check that the multi-information display on the combination meter assembly does not display the rear seat belt warning.

      OK
      The rear seat belt warning is not displayed.

    NG

    READ VALUE USING INTELLIGENT TESTER (REAR DOOR COURTESY LIGHT SWITCH) Click here

    OK

  2. READ VALUE USING INTELLIGENT TESTER (REAR SEAT BELT BUCKLE SWITCH)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the intelligent tester on.

    4. Enter the following menus: Body / Combination Meter / Data List.

    5. Read the Data List according to the display on the intelligent tester.

      Combination Meter (Combination Meter Assembly)
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      2nd-Row Seatbelt Buckle (R) Rear RH seat belt buckle switch signal/ON or OFF

      ON: Rear RH seat belt fastened

      OFF: Rear RH seat belt not fastened

      		 -
      2nd-Row Seatbelt Buckle (L) Rear LH seat belt buckle switch signal/ON or OFF

      ON: Rear LH seat belt fastened

      OFF: Rear LH seat belt not fastened

      		 -
      2nd-Row Seatbelt Buckle (C) Rear center seat belt buckle switch signal/ON or OFF

      ON: Rear center seat belt fastened

      OFF: Rear center seat belt not fastened

      		 -
      OK
      ON or OFF appears on the tester screen according to the rear seat belt condition.
      Result
      Result Proceed to
      OK or NG (for all seat belt) A
      NG (for rear RH seat belt) B
      NG (for rear center seat belt) C
      NG (for rear LH seat belt) D

    B

    INSPECT REAR SEAT INNER BELT ASSEMBLY (FOR RH) Click here

    C

    INSPECT REAR SEAT INNER W/ CENTER BELT ASSEMBLY LH (FOR CENTER) Click here

    D

    INSPECT REAR SEAT INNER W/ CENTER BELT ASSEMBLY LH (FOR LH) Click here

    A

    REPLACE COMBINATION METER ASSEMBLY Click here

  3. READ VALUE USING INTELLIGENT TESTER (REAR DOOR COURTESY LIGHT SWITCH)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the intelligent tester on.

    4. Enter the following menus: Body / Main Body / Data List.

    5. Read the Data List according to the display on the intelligent tester.

      Main Body (Main Body ECU (Multiplex Network Body ECU))
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      RR Door Courtesy SW Rear door courtesy light switch signal/ON or OFF

      ON: Rear door RH open

      OFF: Rear door RH closed

      		 -
      RL Door Courtesy SW Rear door courtesy light switch signal/ON or OFF

      ON: Rear door LH open

      OFF: Rear door LH closed

      		 -
      OK
      ON or OFF appears on the tester screen according to the rear door condition.

    NG

    GO TO LIGHTING SYSTEM Click here

    OK

  4. REPLACE COMBINATION METER ASSEMBLY


    1. Replace the combination meter assembly Click here.


    NEXT

  5. CHECK REAR SEAT BELT WARNING


    1. Check the rear seat belt warning function Click here.

      OK
      The rear seat belt warning function operates normally.

    NG

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

    OK

    END (COMBINATION METER ASSEMBLY)

  6. INSPECT REAR SEAT INNER BELT ASSEMBLY (FOR RH)


    1. A003WVVE01
      Text in Illustration
      *a

      Component without harness connected

      (Rear Seat Inner Belt Assembly (for RH))

      Remove the rear seat inner belt assembly (for RH) Click here.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 - 2 Rear RH seat belt fastened Below 1 Ω
      1 - 2 Rear RH seat belt not fastened 10 kΩ or higher

    NG

    REPLACE REAR SEAT INNER BELT ASSEMBLY (FOR RH) Click here

    OK

  7. CHECK HARNESS AND CONNECTOR (REAR SEAT INNER BELT - COMBINATION METER)


    1. Disconnect the H19 combination meter assembly connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      H19-4 (RRSB) - P17-1 Always Below 1 Ω
      H19-4 (RRSB) - Body ground Always 10 kΩ or higher
      P17-2 - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE COMBINATION METER ASSEMBLY Click here

  8. INSPECT REAR SEAT INNER W/ CENTER BELT ASSEMBLY LH (FOR CENTER)


    1. A003Y7VE05
      Text in Illustration
      *a

      Component without harness connected

      (Rear Seat Inner w/ Center Belt Assembly LH (for Center))

      Remove the rear seat inner w/ center belt assembly LH (for Center) Click here.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 - 2 Rear center seat belt fastened Below 1 Ω
      1 - 2 Rear center seat belt not fastened 10 kΩ or higher

    NG

    REPLACE REAR SEAT INNER W/ CENTER BELT ASSEMBLY LH (FOR CENTER) Click here

    OK

  9. CHECK HARNESS AND CONNECTOR (REAR SEAT INNER W/ CENTER BELT ASSEMBLY LH - COMBINATION METER)


    1. Disconnect the H19 combination meter assembly connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      H19-5 (RCSB) - P18-1 Always Below 1 Ω
      H19-5 (RCSB) - Body ground Always 10 kΩ or higher
      P18-2 - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE COMBINATION METER ASSEMBLY Click here

  10. INSPECT REAR SEAT INNER W/ CENTER BELT ASSEMBLY LH (FOR LH)


    1. A003W9RE02
      Text in Illustration
      *a

      Component without harness connected

      (Rear Seat Inner w/ Center Belt Assembly LH (for LH))

      Remove the rear seat inner w/ center belt assembly LH (for LH) Click here.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 - 2 Rear LH seat belt fastened Below 1 Ω
      1 - 2 Rear LH seat belt not fastened 10 kΩ or higher

    NG

    REPLACE REAR SEAT INNER W/ CENTER BELT ASSEMBLY LH (FOR LH) Click here

    OK

  11. CHECK HARNESS AND CONNECTOR (REAR SEAT INNER W/ CENTER BELT ASSEMBLY LH - COMBINATION METER)


    1. Disconnect the H19 combination meter assembly connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      H19-6 (RLSB) - P19-1 Always Below 1 Ω
      H19-6 (RLSB) - Body ground Always 10 kΩ or higher
      P19-2 - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE COMBINATION METER ASSEMBLY Click here